I think the perspective near the eye area is a bit off. The nose and the thing connecting the nose should be turned a bit to the left more... and perhaps a bit of eye showing would help. The right eye could benifit from a bit more of shinyness. But hey I really like the picture...... kind of reminds me of playboy. hehe

it's just a bunny in a business suit carrying a briefcase in front of a pretty green background.

AHH!! NO!!! it's a bunny in a business suit carrying a briefcase in front of a pretty green background!!

hehe yeah. looks extremely terrific. i like the many colors you used you used to make up the skin and the background, as well as the shadowing and lighting in general. heh, he even has a shiny for the lower corner of his eye. neat. suggestions, though.. the suit needs a little more variation of color like the rest of the pic has. his hands need to be furry (unless you were suggesting human hands.. creepy).